Chip fan for routing machines



July 12,1927. 1,635,769

V. ROYLE CHIP FAN FOR ROUTING MACHINES Filed Jan. 25. 1922 E 0 W i 1 ll 0 2 21:11 1 2 a; 3

3 wveutoz Patented July 12, 1927.

vnimon BOYLE, or PATERSQN, New JERSEY.

CHI]? ran FOR ROUTING MACHINES.

Application filed January 25, 1922. Serial No. 531,798.

This invention relates to an improvement in chip fans for routing machines and has foran ob ectv to provide such a device which is cheap to manufacture and yet perfectly balanced.

Another objectconsists in providing such a device which may be readily secured in position without, the employment of screws or the "like.

A further object consists: in providing such a deviceiwhich is very light and yet durable and efficient. in operation.

-A still further object consists in. providing certain improvements in the form, constructionv and arrangement of the different elements of tl e'idevice whereby the above 1 named and other objects may be effectively attained.v

In the use of routing machines, the operator is generally following some. course which it is-necessary for. him to have in guide thetool.

view at all times so that he may properly Naturally, the routing operation-generates an accumulation of chips or shavings which must be removed concurrently with the operation of the tool, if the workman is tohave an unobstructed view of the work. Furthermore, this accumulation ofchips or shavings should beremoved as the device is operating, in *order'to prevent the samefrom working under the tool and,

possibly, hindering its perfect operation.

In order to acCo-mplislrthis object, it has been common to provide thespindleof the routing machine head which carries the tool,

I withifan bladesso arranged as .to give rise to'a downward currentof air. during the rotation of .the tool, These blades have commonly been made separately and provided with shanks threaded into the spindle of the routing machine head. This operation has beensomewhat expensive and has always been subject to the liability of the several blades being set at a slightly different angle to the axis of the too-l, being of slightly different shape or surface smoothness, being slightly different in weight, and having a slightly different contact with the exterior surface of the spindle. Any one of these variations tends to give rise to a humming sound, which is annoying, and to vibration of the tool, which hinders its per fect operation. In contemplation of these disadvantages, I have made the invention which the subject matter of thepresent application.

A practical embodiment of my invention 4 ings, in which Fig. 1 represents a side elevation of an is represented in the accompanying idraw-,.

improved form of router head with my fan in position thereon. 1

Flg. 2 represents a top plan view of a four blade fan embodying my. invention. 7 1 Fig. 3 represents a side elevation of thesame, with a portion of the spindle shown in dotted lines.

- Fig. i-represents a bottom plan view of the same.

Figs. 5, 6 and 7 correspond with Figs. 2, 3 and 4, respectively, except thata three bladefan is shown.

In producing my. improved fan, suitable sheet material, such as steel, is selected, and is sub ected to a stamping operation, effected in a well-known manner by the useof suitable dies, which operation completely.

forms the fan.

The fan consists of a collar 1 whichis of such size as to have a sliding fit upon the exteriorjof a, standard size of routingmachlne spindle. This collar is preferably arranged soas to be of slightly less interior dlametenat one edge than at the other so that it will frictionally grip the exterior of the spindle-as it is forced upwardly thereon in order to'firmly hold, the fan in position, as shownin Fig. 1; and I prefer 'to' make the slightly larger diameter at the" edge from which the blades project. However, the elasticity of the sheet metal from which the fan is stamped, is adequate to hold it in position eventhough thebore of th e'collar be of equal diameterthroughout,

by arranging that thesaid bore shall be of the same diameter as the exterior. of the spindle to which it is intended to be plied, the assembly being made by the usual driving fit operation.

At one edge of the collar, preferably at the upper portion, a flange 2 projects laterally therefrom for a slight distance. This flange is integral with the collar and is formed by the stamping operation already mentioned. 'At'equidistant points the pe- -blades' 3, which are-also integral with the device and formed by the stamping operariphery of the flange 2 is developed into fan tion. its already indicated, there are tour of these blades in the forth shown in leigs. l to l inclusive, while only three blades are shown in the tnoditied :lorn'i shown in .l igs. 5 to "i' inclusive.

These blades are preferably curred in transverse cross rection, and have their outer edges turned downwardly, as represented at l, in order that they may more ctlectually trap air and torcc it down along the sides of the tool to disperse the accumulation otf debris. ldurtherniore, it, will be noted that the blades 1-, in spite of their transverse curvature, are integral with the flange 3 throughout; their entire width. This is etlooted by causing the stamping operation which curves the blade to learn a web 5 con-- necting that part of each blade which is curved out ot the plane ot the flange El, with the said flange. this greatly in reases the strength, rigidity and durability ot the device.

he already indicated, Ti t represents the device in position on the h ii at routine machine but, as the said head nta arclldtnotrn or approred 'urni, l

scribe the saine herein.

\i' trill n t dewhich are pert tilt' oration using dies curate. llheretore, the result is the produr-- tion ol' such an article which i-.i at forth in. shape, size, balance and stir as to always accurately tit and operat itout entailing any o t the disadrantap-es heretolore experienced. l urther, this device may he, to cheaply made as to he sold for less than the actual cost ot a single one ol' the eeparat'c blades heretofore ctuunuinly einployed.

l. have also :tound thatthis fan lends it- :elit readily to the inscription oi. advertising matter or legends which may appropriately apply to the tool in connection W h the fan is intended to be employee. blades not only provide )ttltl for suitable inscriptions, indicated at t in x i3 and :l, but the stamping operation whit jl ornis the blades can also be used lor impart ing the ltlts'tfl'lpt'lt'lllS thereto.

I desire it to be understood that various reamed changes may be resorted to in the form, arrataz ctncnt, composition and method of pro during tl e device without departing from the spirit: and scope of my invention; and hence it do not intend to be limited to the details herein shown and described, except as they may be included in the claims.

"it'hati fl claim is:

.l. i'tn article oi? the character described comprising, a collar, a lateral flange detelopetl 'lroin one edge of the collar, and blades projecting from the flange, said blades having their outer edges bent dotvnvardly.

:1. 1th article oil the character described ('Uhtiil'iSlllg, a collar, a lateral flange devel oped trout one edge of the collar, and blades projecting from the flange, said blades being carved in cross section and having their tittitt edges bent downwardly.

Li. .Ytn article of the character described comprising, a collar, a lateral flange developed from one edge Of the collar, and blades derelupcd and projecting from the flange, said collar being of less diameter at one edge than at the other.

l. Stu article of the character described comprising, a collar having an annular tlange dtnxrloped laterally from one edge thercot', and, blades projecting from and connected with said flange throughout substantially their entire width.

.It. .ta article of the character described ianaprising, a collar having an annular flange developed laterally from one edge thereof, blades projecting from said flange, a portion or each blade, lying in a dill'ercnt parallel plane from the plane of the flange, and a eb connecting the said portion with the said mange.

t5. An article of the character described comprising, a collar having an annular flange developed laterally from one edge thereof, blades projecting from the periphery of the flange, a portion of each blade extending away from said flange toward the opposite ed ot the collar, and awcb lying in a plane substantially parallel to the axis of the collar and connecting the said portion with the periphery of the said flange.

in tet-itiinony that I claim the foregoing as my intention, I have signed my name this lt-lth d ay of January, 1922.

VERNON BOYLE.

tit) 

